Probably not. Your MOC's board will not make a final decision until after the due date, when all applications have been received and reviewed, and interviews have been completed. If you are taking the ACT/SAT again, or expect to receive an award at the beginning of the school year (say you are named captain of a team, etc), it doesn't hurt to wait as long as you make their deadline. It's easier to send in a complete "best" package, than to keep updating the MOC's coordinator with new info / test scores, but you can certainly send in those new items/updates. If you do have new test scores/awards after your application has been sent and received, bring a copy with you to the interview.